adjective An adjective is a word that describes or gives more information about a noun. In this case, 'main' is an adjective that describes something as being primary or most important.
- The main purpose of the meeting is to discuss the new project proposal.
- The main thing we need to do is finish the report by tomorrow.
- The main idea behind the plan is to make some quick cash.
- She is the main source of inspiration for the team.